os/hosts/droppie/restic-backup.nix

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{pkgs, ...}: let
shutdownWaitMinutes = 15;
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shutdownScript = pkgs.writeShellScriptBin "shutdown-wait" ''
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STATUS_FILES="/media/internal/backups-pub-solar/status"
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running=""
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for f in $STATUS_FILES; do
declare started
declare finished
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started=$(source $f ; echo ''${BACKUP_STARTED})
finished=$(source $f ; echo ''${BACKUP_FINISHED})
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if [ -z "''${finished}" ]; then
echo "backup $(dirname $f) still running"
running="yes"
break
fi
done
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if [ -n "''${running}" ] && [ "''${running}" = "yes" ]; then
echo "backups are still running"
exit 1
fi
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echo "WARNING: System will be shut down within the next 15 minutes" | wall
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sleep 10
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shutdown -P +${builtins.toString shutdownWaitMinutes}
'';
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in {
systemd.services."shutdown-after-backup" = {
enable = true;
serviceConfig = {
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ExecStart = "${shutdownScript}/bin/shutdown-wait";
Type = "oneshot";
};
};
systemd.timers."shutdown-after-backup" = {
enable = true;
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timerConfig = {
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OnCalendar = "*-*-* 03..09:30:00 Etc/UTC";
};
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wantedBy = ["timers.target"];
partOf = ["shutdown-after-backup.service"];
};
}